package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 执行关联查询
 */
public class JDBCDemo6 {
    public static void main(String[] args) {
        try {
            Connection con=DBUtil.getConnection();
            Statement statement=con.createStatement();
            String sql="SELECT t.name,t.gender,c.name,c.floor\n" +
                    "FROM teacher t,class c\n" +
                    "WHERE t.id=c.teacher_id AND t.name='王克晶'";
            ResultSet rs=statement.executeQuery(sql);
            while (rs.next()){
                String name=rs.getString("t.name");
                String gender=rs.getString("t.gender");
                String className=rs.getString("c.name");
                int floor=rs.getInt("c.floor");
                System.out.println(name+","+gender+","+className+","+floor);
                /*
                也支持通过字段下标获取，注意：下标从1开始。
                String name=rs.getString(1);
                String gender=rs.getString(2);
                String className=rs.getString(3);
                int floor=rs.getInt(4);
                 */
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
